Remove environment.Environment struct

This commit completely removes the environment struct as it is no longer
used.

internal/dis/component/exporter/backup.go

@@ -94,7 +94,6 @@ func (backup *Backup) run(ctx context.Context, progress io.Writer, exporter *Exp
 				return bc.Backup(
 					component.NewStagingContext(
 						ctx,
-						exporter.Environment,
 						writer,
 						filepath.Join(backup.Description.Dest, bc.BackupName()),
 						manifest,

internal/dis/component/exporter/iface.go

@@ -147,7 +147,7 @@ func (exporter *Exporter) MakeExport(ctx context.Context, progress io.Writer, ta
 		st.Start()
 		defer st.Stop()
 
-		count, err = targz.Package(exporter.Environment, archivePath, stagingDir, func(dst, src string) {
+		count, err = targz.Package(archivePath, stagingDir, func(dst, src string) {
 			st.Set(0, dst)
 		})
 

internal/dis/component/exporter/snapshot.go

@@ -124,7 +124,6 @@ func (snapshot *Snapshot) makeParts(ctx context.Context, progress io.Writer, sna
 				instance.Instance,
 				component.NewStagingContext(
 					ctx,
-					snapshots.Environment,
 					writer,
 					filepath.Join(snapshot.Description.Dest, sc.SnapshotName()),
 					manifest,